/* Javascript plotting library for jQuery, version 0.8 alpha. Copyright (c) 2007-2012 IOLA and Ole Laursen. Licensed under the MIT license. */ // first an inline dependency, jquery.colorhelpers.js, we inline it here // for convenience /* Plugin for jQuery for working with colors. * * Version 1.1. * * Inspiration from jQuery color animation plugin by John Resig. * * Released under the MIT license by Ole Laursen, October 2009. * * Examples: * * $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString() * var c = $.color.extract($("#mydiv"), 'background-color'); * console.log(c.r, c.g, c.b, c.a); * $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)" * * Note that .scale() and .add() return the same modified object * instead of making a new one. * * V. 1.1: Fix error handling so e.g. parsing an empty string does * produce a color rather than just crashing. */ (function (B) { B.color = {}; B.color.make = function (F, E, C, D) { var G = {}; G.r = F || 0; G.g = E || 0; G.b = C || 0; G.a = D != null ? D : 1; G.add = function (J, I) { for (var H = 0; H < J.length; ++H) { G[J.charAt(H)] += I; } return G.normalize(); }; G.scale = function (J, I) { for (var H = 0; H < J.length; ++H) { G[J.charAt(H)] *= I; } return G.normalize(); }; G.toString = function () { if (G.a >= 1) { return "rgb(" + [G.r, G.g, G.b].join(",") + ")"; } else { return "rgba(" + [G.r, G.g, G.b, G.a].join(",") + ")"; } }; G.normalize = function () { function H(J, K, I) { return K < J ? J : K > I ? I : K; } G.r = H(0, parseInt(G.r), 255); G.g = H(0, parseInt(G.g), 255); G.b = H(0, parseInt(G.b), 255); G.a = H(0, G.a, 1); return G; }; G.clone = function () { return B.color.make(G.r, G.b, G.g, G.a); }; return G.normalize(); }; B.color.extract = function (D, C) { var E; do { E = D.css(C).toLowerCase(); if (E != "" && E != "transparent") { break; } D = D.parent(); } while (!B.nodeName(D.get(0), "body")); if (E == "rgba(0, 0, 0, 0)") { E = "transparent"; } return B.color.parse(E); }; B.color.parse = function (F) { var E, C = B.color.make; if ( (E = /rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec( F )) ) { return C(parseInt(E[1], 10), parseInt(E[2], 10), parseInt(E[3], 10)); } if ( (E = /rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec( F )) ) { return C( parseInt(E[1], 10), parseInt(E[2], 10), parseInt(E[3], 10), parseFloat(E[4]) ); } if ( (E = /rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec( F )) ) { return C( parseFloat(E[1]) * 2.55, parseFloat(E[2]) * 2.55, parseFloat(E[3]) * 2.55 ); } if ( (E = /rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec( F )) ) { return C( parseFloat(E[1]) * 2.55, parseFloat(E[2]) * 2.55, parseFloat(E[3]) * 2.55, parseFloat(E[4]) ); } if ((E = /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F))) { return C(parseInt(E[1], 16), parseInt(E[2], 16), parseInt(E[3], 16)); } if ((E = /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(F))) { return C( parseInt(E[1] + E[1], 16), parseInt(E[2] + E[2], 16), parseInt(E[3] + E[3], 16) ); } var D = B.trim(F).toLowerCase(); if (D == "transparent") { return C(255, 255, 255, 0); } else { E = A[D] || [0, 0, 0]; return C(E[0], E[1], E[2]); } }; var A = { aqua: [0, 255, 255], azure: [240, 255, 255], beige: [245, 245, 220], black: [0, 0, 0], blue: [0, 0, 255], brown: [165, 42, 42], cyan: [0, 255, 255], darkblue: [0, 0, 139], darkcyan: [0, 139, 139], darkgrey: [169, 169, 169], darkgreen: [0, 100, 0], darkkhaki: [189, 183, 107], darkmagenta: [139, 0, 139], darkolivegreen: [85, 107, 47], darkorange: [255, 140, 0], darkorchid: [153, 50, 204], darkred: [139, 0, 0], darksalmon: [233, 150, 122], darkviolet: [148, 0, 211], fuchsia: [255, 0, 255], gold: [255, 215, 0], green: [0, 128, 0], indigo: [75, 0, 130], khaki: [240, 230, 140], lightblue: [173, 216, 230], lightcyan: [224, 255, 255], lightgreen: [144, 238, 144], lightgrey: [211, 211, 211], lightpink: [255, 182, 193], lightyellow: [255, 255, 224], lime: [0, 255, 0], magenta: [255, 0, 255], maroon: [128, 0, 0], navy: [0, 0, 128], olive: [128, 128, 0], orange: [255, 165, 0], pink: [255, 192, 203], purple: [128, 0, 128], violet: [128, 0, 128], red: [255, 0, 0], silver: [192, 192, 192], white: [255, 255, 255], yellow: [255, 255, 0], }; })(jQuery); // the actual Flot code (function ($) { function Plot(placeholder, data_, options_, plugins) { // data is on the form: // [ series1, series2 ... ] // where series is either just the data as [ [x1, y1], [x2, y2], ... ] // or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... } var series = [], options = { // the color theme used for graphs colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"], legend: { show: true, noColumns: 1, // number of colums in legend table labelFormatter: null, // fn: string -> string labelBoxBorderColor: "#ccc", // border color for the little label boxes container: null, // container (as jQuery object) to put legend in, null means default on top of graph position: "ne", // position of default legend container within plot margin: 5, // distance from grid edge to default legend container within plot backgroundColor: null, // null means auto-detect backgroundOpacity: 0.85, // set to 0 to avoid background sorted: null, // default to no legend sorting }, xaxis: { show: null, // null = auto-detect, true = always, false = never position: "bottom", // or "top" mode: null, // null or "time" timezone: null, // "browser" for local to the client or timezone for timezone-js font: null, // null (derived from CSS in placeholder) or object like { size: 11, style: "italic", weight: "bold", family: "sans-serif", variant: "small-caps" } color: null, // base color, labels, ticks tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)" transform: null, // null or f: number -> number to transform axis inverseTransform: null, // if transform is set, this should be the inverse function min: null, // min. value to show, null means set automatically max: null, // max. value to show, null means set automatically autoscaleMargin: null, // margin in % to add if auto-setting min/max ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks tickFormatter: null, // fn: number -> string labelWidth: null, // size of tick labels in pixels labelHeight: null, reserveSpace: null, // whether to reserve space even if axis isn't shown tickLength: null, // size in pixels of ticks, or "full" for whole line alignTicksWithAxis: null, // axis number or null for no sync // mode specific options tickDecimals: null, // no. of decimals, null means auto tickSize: null, // number or [number, "unit"] minTickSize: null, // number or [number, "unit"] monthNames: null, // list of names of months timeformat: null, // format string to use twelveHourClock: false, // 12 or 24 time in time mode }, yaxis: { autoscaleMargin: 0.02, position: "left", // or "right" }, xaxes: [], yaxes: [], series: { points: { show: false, radius: 3, lineWidth: 2, // in pixels fill: true, fillColor: "#ffffff", symbol: "circle", // or callback }, lines: { // we don't put in show: false so we can see // whether lines were actively disabled lineWidth: 2, // in pixels fill: false, fillColor: null, steps: false, // Omit 'zero', so we can later default its value to // match that of the 'fill' option. }, bars: { show: false, lineWidth: 2, // in pixels barWidth: 1, // in units of the x axis fill: true, fillColor: null, align: "left", // "left", "right", or "center" horizontal: false, zero: true, }, shadowSize: 3, highlightColor: null, }, grid: { show: true, aboveData: false, color: "#545454", // primary color used for outline and labels backgroundColor: null, // null for transparent, else color borderColor: null, // set if different from the grid color tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)" margin: 0, // distance from the canvas edge to the grid labelMargin: 5, // in pixels axisMargin: 8, // in pixels borderWidth: 2, // in pixels minBorderMargin: null, // in pixels, null means taken from points radius markings: null, // array of ranges or fn: axes -> array of ranges markingsColor: "#f4f4f4", markingsLineWidth: 2, // interactive stuff clickable: false, hoverable: false, autoHighlight: true, // highlight in case mouse is near mouseActiveRadius: 10, // how far the mouse can be away to activate an item }, interaction: { redrawOverlayInterval: 1000 / 60, // time between updates, -1 means in same flow }, hooks: {}, }, canvas = null, // the canvas for the plot itself overlay = null, // canvas for interactive stuff on top of plot eventHolder = null, // jQuery object that events should be bound to ctx = null, octx = null, xaxes = [], yaxes = [], plotOffset = { left: 0, right: 0, top: 0, bottom: 0 }, canvasWidth = 0, canvasHeight = 0, plotWidth = 0, plotHeight = 0, hooks = { processOptions: [], processRawData: [], processDatapoints: [], processOffset: [], drawBackground: [], drawSeries: [], draw: [], bindEvents: [], drawOverlay: [], shutdown: [], }, plot = this; // public functions plot.setData = setData; plot.setupGrid = setupGrid; plot.draw = draw; plot.getPlaceholder = function () { return placeholder; }; plot.getCanvas = function () { return canvas; }; plot.getPlotOffset = function () { return plotOffset; }; plot.width = function () { return plotWidth; }; plot.height = function () { return plotHeight; }; plot.offset = function () { var o = eventHolder.offset(); o.left += plotOffset.left; o.top += plotOffset.top; return o; }; plot.getData = function () { return series; }; plot.getAxes = function () { var res = {}, i; $.each(xaxes.concat(yaxes), function (_, axis) { if (axis) res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis; }); return res; }; plot.getXAxes = function () { return xaxes; }; plot.getYAxes = function () { return yaxes; }; plot.c2p = canvasToAxisCoords; plot.p2c = axisToCanvasCoords; plot.getOptions = function () { return options; }; plot.highlight = highlight; plot.unhighlight = unhighlight; plot.triggerRedrawOverlay = triggerRedrawOverlay; plot.pointOffset = function (point) { return { left: parseInt( xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left, 10 ), top: parseInt( yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top, 10 ), }; }; plot.shutdown = shutdown; plot.resize = function () { getCanvasDimensions(); resizeCanvas(canvas); resizeCanvas(overlay); }; // public attributes plot.hooks = hooks; // initialize initPlugins(plot); parseOptions(options_); setupCanvases(); setData(data_); setupGrid(); draw(); bindEvents(); function executeHooks(hook, args) { args = [plot].concat(args); for (var i = 0; i < hook.length; ++i) hook[i].apply(this, args); } function initPlugins() { for (var i = 0; i < plugins.length; ++i) { var p = plugins[i]; p.init(plot); if (p.options) $.extend(true, options, p.options); } } function parseOptions(opts) { var i; $.extend(true, options, opts); if (options.xaxis.color == null) options.xaxis.color = options.grid.color; if (options.yaxis.color == null) options.yaxis.color = options.grid.color; if (options.xaxis.tickColor == null) // backwards-compatibility options.xaxis.tickColor = options.grid.tickColor; if (options.yaxis.tickColor == null) // backwards-compatibility options.yaxis.tickColor = options.grid.tickColor; if (options.grid.borderColor == null) options.grid.borderColor = options.grid.color; if (options.grid.tickColor == null) options.grid.tickColor = $.color .parse(options.grid.color) .scale("a", 0.22) .toString(); // fill in defaults in axes, copy at least always the // first as the rest of the code assumes it'll be there for (i = 0; i < Math.max(1, options.xaxes.length); ++i) options.xaxes[i] = $.extend(true, {}, options.xaxis, options.xaxes[i]); for (i = 0; i < Math.max(1, options.yaxes.length); ++i) options.yaxes[i] = $.extend(true, {}, options.yaxis, options.yaxes[i]); // backwards compatibility, to be removed in future if (options.xaxis.noTicks && options.xaxis.ticks == null) options.xaxis.ticks = options.xaxis.noTicks; if (options.yaxis.noTicks && options.yaxis.ticks == null) options.yaxis.ticks = options.yaxis.noTicks; if (options.x2axis) { options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis); options.xaxes[1].position = "top"; } if (options.y2axis) { options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis); options.yaxes[1].position = "right"; } if (options.grid.coloredAreas) options.grid.markings = options.grid.coloredAreas; if (options.grid.coloredAreasColor) options.grid.markingsColor = options.grid.coloredAreasColor; if (options.lines) $.extend(true, options.series.lines, options.lines); if (options.points) $.extend(true, options.series.points, options.points); if (options.bars) $.extend(true, options.series.bars, options.bars); if (options.shadowSize != null) options.series.shadowSize = options.shadowSize; if (options.highlightColor != null) options.series.highlightColor = options.highlightColor; // save options on axes for future reference for (i = 0; i < options.xaxes.length; ++i) getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i]; for (i = 0; i < options.yaxes.length; ++i) getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i]; // add hooks from options for (var n in hooks) if (options.hooks[n] && options.hooks[n].length) hooks[n] = hooks[n].concat(options.hooks[n]); executeHooks(hooks.processOptions, [options]); } function setData(d) { series = parseData(d); fillInSeriesOptions(); processData(); } function parseData(d) { var res = []; for (var i = 0; i < d.length; ++i) { var s = $.extend(true, {}, options.series); if (d[i].data != null) { s.data = d[i].data; // move the data instead of deep-copy delete d[i].data; $.extend(true, s, d[i]); d[i].data = s.data; } else s.data = d[i]; res.push(s); } return res; } function axisNumber(obj, coord) { var a = obj[coord + "axis"]; if (typeof a == "object") // if we got a real axis, extract number a = a.n; if (typeof a != "number") a = 1; // default to first axis return a; } function allAxes() { // return flat array without annoying null entries return $.grep(xaxes.concat(yaxes), function (a) { return a; }); } function canvasToAxisCoords(pos) { // return an object with x/y corresponding to all used axes var res = {}, i, axis; for (i = 0; i < xaxes.length; ++i) { axis = xaxes[i]; if (axis && axis.used) res["x" + axis.n] = axis.c2p(pos.left); } for (i = 0; i < yaxes.length; ++i) { axis = yaxes[i]; if (axis && axis.used) res["y" + axis.n] = axis.c2p(pos.top); } if (res.x1 !== undefined) res.x = res.x1; if (res.y1 !== undefined) res.y = res.y1; return res; } function axisToCanvasCoords(pos) { // get canvas coords from the first pair of x/y found in pos var res = {}, i, axis, key; for (i = 0; i < xaxes.length; ++i) { axis = xaxes[i]; if (axis && axis.used) { key = "x" + axis.n; if (pos[key] == null && axis.n == 1) key = "x"; if (pos[key] != null) { res.left = axis.p2c(pos[key]); break; } } } for (i = 0; i < yaxes.length; ++i) { axis = yaxes[i]; if (axis && axis.used) { key = "y" + axis.n; if (pos[key] == null && axis.n == 1) key = "y"; if (pos[key] != null) { res.top = axis.p2c(pos[key]); break; } } } return res; } function getOrCreateAxis(axes, number) { if (!axes[number - 1]) axes[number - 1] = { n: number, // save the number for future reference direction: axes == xaxes ? "x" : "y", options: $.extend( true, {}, axes == xaxes ? options.xaxis : options.yaxis ), }; return axes[number - 1]; } function fillInSeriesOptions() { var neededColors = series.length, maxIndex = -1, i; // Subtract the number of series that already have fixed colors or // color indexes from the number that we still need to generate. for (i = 0; i < series.length; ++i) { var sc = series[i].color; if (sc != null) { neededColors--; if (typeof sc == "number" && sc > maxIndex) { maxIndex = sc; } } } // If any of the series have fixed color indexes, then we need to // generate at least as many colors as the highest index. if (neededColors <= maxIndex) { neededColors = maxIndex + 1; } // Generate all the colors, using first the option colors and then // variations on those colors once they're exhausted. var c, colors = [], colorPool = options.colors, colorPoolSize = colorPool.length, variation = 0; for (i = 0; i < neededColors; i++) { c = $.color.parse(colorPool[i % colorPoolSize] || "#666"); // Each time we exhaust the colors in the pool we adjust // a scaling factor used to produce more variations on // those colors. The factor alternates negative/positive // to produce lighter/darker colors. // Reset the variation after every few cycles, or else // it will end up producing only white or black colors. if (i % colorPoolSize == 0 && i) { if (variation >= 0) { if (variation < 0.5) { variation = -variation - 0.2; } else variation = 0; } else variation = -variation; } colors[i] = c.scale("rgb", 1 + variation); } // Finalize the series options, filling in their colors var colori = 0, s; for (i = 0; i < series.length; ++i) { s = series[i]; // assign colors if (s.color == null) { s.color = colors[colori].toString(); ++colori; } else if (typeof s.color == "number") s.color = colors[s.color].toString(); // turn on lines automatically in case nothing is set if (s.lines.show == null) { var v, show = true; for (v in s) if (s[v] && s[v].show) { show = false; break; } if (show) s.lines.show = true; } // If nothing was provided for lines.zero, default it to match // lines.fill, since areas by default should extend to zero. if (s.lines.zero == null) { s.lines.zero = !!s.lines.fill; } // setup axes s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x")); s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y")); } } function processData() { var topSentry = Number.POSITIVE_INFINITY, bottomSentry = Number.NEGATIVE_INFINITY, fakeInfinity = Number.MAX_VALUE, i, j, k, m, length, s, points, ps, x, y, axis, val, f, p, data, format; function updateAxis(axis, min, max) { if (min < axis.datamin && min != -fakeInfinity) axis.datamin = min; if (max > axis.datamax && max != fakeInfinity) axis.datamax = max; } $.each(allAxes(), function (_, axis) { // init axis axis.datamin = topSentry; axis.datamax = bottomSentry; axis.used = false; }); for (i = 0; i < series.length; ++i) { s = series[i]; s.datapoints = { points: [] }; executeHooks(hooks.processRawData, [s, s.data, s.datapoints]); } // first pass: clean and copy data for (i = 0; i < series.length; ++i) { s = series[i]; data = s.data; format = s.datapoints.format; if (!format) { format = []; // find out how to copy format.push({ x: true, number: true, required: true }); format.push({ y: true, number: true, required: true }); if (s.bars.show || (s.lines.show && s.lines.fill)) { var autoscale = !!( (s.bars.show && s.bars.zero) || (s.lines.show && s.lines.zero) ); format.push({ y: true, number: true, required: false, defaultValue: 0, autoscale: autoscale, }); if (s.bars.horizontal) { delete format[format.length - 1].y; format[format.length - 1].x = true; } } s.datapoints.format = format; } if (s.datapoints.pointsize != null) continue; // already filled in s.datapoints.pointsize = format.length; ps = s.datapoints.pointsize; points = s.datapoints.points; var insertSteps = s.lines.show && s.lines.steps; s.xaxis.used = s.yaxis.used = true; for (j = k = 0; j < data.length; ++j, k += ps) { p = data[j]; var nullify = p == null; if (!nullify) { for (m = 0; m < ps; ++m) { val = p[m]; f = format[m]; if (f) { if (f.number && val != null) { val = +val; // convert to number if (isNaN(val)) val = null; else if (val == Infinity) val = fakeInfinity; else if (val == -Infinity) val = -fakeInfinity; } if (val == null) { if (f.required) nullify = true; if (f.defaultValue != null) val = f.defaultValue; } } points[k + m] = val; } } if (nullify) { for (m = 0; m < ps; ++m) { val = points[k + m]; if (val != null) { f = format[m]; // extract min/max info if (f.x) updateAxis(s.xaxis, val, val); if (f.y) updateAxis(s.yaxis, val, val); } points[k + m] = null; } } else { // a little bit of line specific stuff that // perhaps shouldn't be here, but lacking // better means... if ( insertSteps && k > 0 && points[k - ps] != null && points[k - ps] != points[k] && points[k - ps + 1] != points[k + 1] ) { // copy the point to make room for a middle point for (m = 0; m < ps; ++m) points[k + ps + m] = points[k + m]; // middle point has same y points[k + 1] = points[k - ps + 1]; // we've added a point, better reflect that k += ps; } } } } // give the hooks a chance to run for (i = 0; i < series.length; ++i) { s = series[i]; executeHooks(hooks.processDatapoints, [s, s.datapoints]); } // second pass: find datamax/datamin for auto-scaling for (i = 0; i < series.length; ++i) { s = series[i]; (points = s.datapoints.points), (ps = s.datapoints.pointsize); format = s.datapoints.format; var xmin = topSentry, ymin = topSentry, xmax = bottomSentry, ymax = bottomSentry; for (j = 0; j < points.length; j += ps) { if (points[j] == null) continue; for (m = 0; m < ps; ++m) { val = points[j + m]; f = format[m]; if ( !f || f.autoscale === false || val == fakeInfinity || val == -fakeInfinity ) continue; if (f.x) { if (val < xmin) xmin = val; if (val > xmax) xmax = val; } if (f.y) { if (val < ymin) ymin = val; if (val > ymax) ymax = val; } } } if (s.bars.show) { // make sure we got room for the bar on the dancing floor var delta; switch (s.bars.align) { case "left": delta = 0; break; case "right": delta = -s.bars.barWidth; break; case "center": delta = -s.bars.barWidth / 2; break; default: throw new Error("Invalid bar alignment: " + s.bars.align); } if (s.bars.horizontal) { ymin += delta; ymax += delta + s.bars.barWidth; } else { xmin += delta; xmax += delta + s.bars.barWidth; } } updateAxis(s.xaxis, xmin, xmax); updateAxis(s.yaxis, ymin, ymax); } $.each(allAxes(), function (_, axis) { if (axis.datamin == topSentry) axis.datamin = null; if (axis.datamax == bottomSentry) axis.datamax = null; }); } ////////////////////////////////////////////////////////////////////////////////// // Returns the display's ratio between physical and device-independent pixels. // // This is the ratio between the width that the browser advertises and the number // of pixels actually available in that space. The iPhone 4, for example, has a // device-independent width of 320px, but its screen is actually 640px wide. It // therefore has a pixel ratio of 2, while most normal devices have a ratio of 1. function getPixelRatio(cctx) { var devicePixelRatio = window.devicePixelRatio || 1; var backingStoreRatio = cctx.webkitBackingStorePixelRatio || cctx.mozBackingStorePixelRatio || cctx.msBackingStorePixelRatio || cctx.oBackingStorePixelRatio || cctx.backingStorePixelRatio || 1; return devicePixelRatio / backingStoreRatio; } function makeCanvas(cls) { var c = document.createElement("canvas"); c.className = cls; $(c) .css({ direction: "ltr", position: "absolute", left: 0, top: 0 }) .appendTo(placeholder); // If HTML5 Canvas isn't available, fall back to Excanvas if (!c.getContext) { if (window.G_vmlCanvasManager) { c = window.G_vmlCanvasManager.initElement(c); } else { throw new Error( "Canvas is not available. If you're using IE with a fall-back such as Excanvas, then there's either a mistake in your conditional include, or the page has no DOCTYPE and is rendering in Quirks Mode." ); } } var cctx = c.getContext("2d"); // Increase the canvas density based on the display's pixel ratio; basically // giving the canvas more pixels without increasing the size of its element, // to take advantage of the fact that retina displays have that many more // pixels than they actually use for page & element widths. var pixelRatio = getPixelRatio(cctx); c.width = canvasWidth * pixelRatio; c.height = canvasHeight * pixelRatio; c.style.width = canvasWidth + "px"; c.style.height = canvasHeight + "px"; // Save the context so we can reset in case we get replotted cctx.save(); // Scale the coordinate space to match the display density; so even though we // may have twice as many pixels, we still want lines and other drawing to // appear at the same size; the extra pixels will just make them crisper. cctx.scale(pixelRatio, pixelRatio); return c; } function getCanvasDimensions() { canvasWidth = placeholder.width(); canvasHeight = placeholder.height(); if (canvasWidth <= 0 || canvasHeight <= 0) throw new Error( "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight ); } function resizeCanvas(c) { var cctx = c.getContext("2d"); // Handle pixel ratios > 1 for retina displays, as explained in makeCanvas var pixelRatio = getPixelRatio(cctx); // Resizing should reset the state (excanvas seems to be buggy though) if (c.style.width != canvasWidth) { c.width = canvasWidth * pixelRatio; c.style.width = canvasWidth + "px"; } if (c.style.height != canvasHeight) { c.height = canvasHeight * pixelRatio; c.style.height = canvasHeight + "px"; } // so try to get back to the initial state (even if it's // gone now, this should be safe according to the spec) cctx.restore(); // and save again cctx.save(); // Apply scaling for retina displays, as explained in makeCanvas cctx.scale(pixelRatio, pixelRatio); } function setupCanvases() { var reused, existingCanvas = placeholder.children("canvas.flot-base"), existingOverlay = placeholder.children("canvas.flot-overlay"); if (existingCanvas.length == 0 || existingOverlay == 0) { // init everything placeholder.html(""); // make sure placeholder is clear placeholder.css({ padding: 0 }); // padding messes up the positioning if (placeholder.css("position") == "static") placeholder.css("position", "relative"); // for positioning labels and overlay getCanvasDimensions(); canvas = makeCanvas("flot-base"); overlay = makeCanvas("flot-overlay"); // overlay canvas for interactive features reused = false; } else { // reuse existing elements canvas = existingCanvas.get(0); overlay = existingOverlay.get(0); reused = true; } ctx = canvas.getContext("2d"); octx = overlay.getContext("2d"); // define which element we're listening for events on eventHolder = $(overlay); if (reused) { // run shutdown in the old plot object placeholder.data("plot").shutdown(); // reset reused canvases plot.resize(); // make sure overlay pixels are cleared (canvas is cleared when we redraw) octx.clearRect(0, 0, canvasWidth, canvasHeight); // then whack any remaining obvious garbage left eventHolder.unbind(); placeholder.children().not([canvas, overlay]).remove(); } // save in case we get replotted placeholder.data("plot", plot); } function bindEvents() { // bind events if (options.grid.hoverable) { eventHolder.mousemove(onMouseMove); // Use bind, rather than .mouseleave, because we officially // still support jQuery 1.2.6, which doesn't define a shortcut // for mouseenter or mouseleave. This was a bug/oversight that // was fixed somewhere around 1.3.x. We can return to using // .mouseleave when we drop support for 1.2.6. eventHolder.bind("mouseleave", onMouseLeave); } if (options.grid.clickable) eventHolder.click(onClick); executeHooks(hooks.bindEvents, [eventHolder]); } function shutdown() { if (redrawTimeout) clearTimeout(redrawTimeout); eventHolder.unbind("mousemove", onMouseMove); eventHolder.unbind("mouseleave", onMouseLeave); eventHolder.unbind("click", onClick); executeHooks(hooks.shutdown, [eventHolder]); } function setTransformationHelpers(axis) { // set helper functions on the axis, assumes plot area // has been computed already function identity(x) { return x; } var s, m, t = axis.options.transform || identity, it = axis.options.inverseTransform; // precompute how much the axis is scaling a point // in canvas space if (axis.direction == "x") { s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min)); m = Math.min(t(axis.max), t(axis.min)); } else { s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min)); s = -s; m = Math.max(t(axis.max), t(axis.min)); } // data point to canvas coordinate if (t == identity) // slight optimization axis.p2c = function (p) { return (p - m) * s; }; else axis.p2c = function (p) { return (t(p) - m) * s; }; // canvas coordinate to data point if (!it) axis.c2p = function (c) { return m + c / s; }; else axis.c2p = function (c) { return it(m + c / s); }; } function measureTickLabels(axis) { var opts = axis.options, ticks = axis.ticks || [], axisw = opts.labelWidth || 0, axish = opts.labelHeight || 0, f = axis.font; ctx.save(); ctx.font = f.style + " " + f.variant + " " + f.weight + " " + f.size + "px '" + f.family + "'"; for (var i = 0; i < ticks.length; ++i) { var t = ticks[i]; t.lines = []; t.width = t.height = 0; if (!t.label) continue; // accept various kinds of newlines, including HTML ones // (you can actually split directly on regexps in Javascript, // but IE < 9 is unfortunately broken) var lines = (t.label + "") .replace(/
|\r\n|\r/g, "\n") .split("\n"); for (var j = 0; j < lines.length; ++j) { var line = { text: lines[j] }, m = ctx.measureText(line.text); line.width = m.width; // m.height might not be defined, not in the // standard yet line.height = m.height != null ? m.height : f.size; // add a bit of margin since font rendering is // not pixel perfect and cut off letters look // bad, this also doubles as spacing between // lines line.height += Math.round(f.size * 0.15); t.width = Math.max(line.width, t.width); t.height += line.height; t.lines.push(line); } if (opts.labelWidth == null) axisw = Math.max(axisw, t.width); if (opts.labelHeight == null) axish = Math.max(axish, t.height); } ctx.restore(); axis.labelWidth = Math.ceil(axisw); axis.labelHeight = Math.ceil(axish); } function allocateAxisBoxFirstPhase(axis) { // find the bounding box of the axis by looking at label // widths/heights and ticks, make room by diminishing the // plotOffset; this first phase only looks at one // dimension per axis, the other dimension depends on the // other axes so will have to wait var lw = axis.labelWidth, lh = axis.labelHeight, pos = axis.options.position, tickLength = axis.options.tickLength, axisMargin = options.grid.axisMargin, padding = options.grid.labelMargin, all = axis.direction == "x" ? xaxes : yaxes, index, innermost; // determine axis margin var samePosition = $.grep(all, function (a) { return a && a.options.position == pos && a.reserveSpace; }); if ($.inArray(axis, samePosition) == samePosition.length - 1) axisMargin = 0; // outermost // determine tick length - if we're innermost, we can use "full" if (tickLength == null) { var sameDirection = $.grep(all, function (a) { return a && a.reserveSpace; }); innermost = $.inArray(axis, sameDirection) == 0; if (innermost) tickLength = "full"; else tickLength = 5; } if (!isNaN(+tickLength)) padding += +tickLength; // compute box if (axis.direction == "x") { lh += padding; if (pos == "bottom") { plotOffset.bottom += lh + axisMargin; axis.box = { top: canvasHeight - plotOffset.bottom, height: lh }; } else { axis.box = { top: plotOffset.top + axisMargin, height: lh }; plotOffset.top += lh + axisMargin; } } else { lw += padding; if (pos == "left") { axis.box = { left: plotOffset.left + axisMargin, width: lw }; plotOffset.left += lw + axisMargin; } else { plotOffset.right += lw + axisMargin; axis.box = { left: canvasWidth - plotOffset.right, width: lw }; } } // save for future reference axis.position = pos; axis.tickLength = tickLength; axis.box.padding = padding; axis.innermost = innermost; } function allocateAxisBoxSecondPhase(axis) { // now that all axis boxes have been placed in one // dimension, we can set the remaining dimension coordinates if (axis.direction == "x") { axis.box.left = plotOffset.left - axis.labelWidth / 2; axis.box.width = canvasWidth - plotOffset.left - plotOffset.right + axis.labelWidth; } else { axis.box.top = plotOffset.top - axis.labelHeight / 2; axis.box.height = canvasHeight - plotOffset.bottom - plotOffset.top + axis.labelHeight; } } function adjustLayoutForThingsStickingOut() { // possibly adjust plot offset to ensure everything stays // inside the canvas and isn't clipped off var minMargin = options.grid.minBorderMargin, margins = { x: 0, y: 0 }, i, axis; // check stuff from the plot (FIXME: this should just read // a value from the series, otherwise it's impossible to // customize) if (minMargin == null) { minMargin = 0; for (i = 0; i < series.length; ++i) minMargin = Math.max( minMargin, 2 * (series[i].points.radius + series[i].points.lineWidth / 2) ); } margins.x = margins.y = Math.ceil(minMargin); // check axis labels, note we don't check the actual // labels but instead use the overall width/height to not // jump as much around with replots $.each(allAxes(), function (_, axis) { var dir = axis.direction; if (axis.reserveSpace) margins[dir] = Math.ceil( Math.max( margins[dir], (dir == "x" ? axis.labelWidth : axis.labelHeight) / 2 ) ); }); plotOffset.left = Math.max(margins.x, plotOffset.left); plotOffset.right = Math.max(margins.x, plotOffset.right); plotOffset.top = Math.max(margins.y, plotOffset.top); plotOffset.bottom = Math.max(margins.y, plotOffset.bottom); } function setupGrid() { var i, axes = allAxes(), showGrid = options.grid.show; // Initialize the plot's offset from the edge of the canvas for (var a in plotOffset) { var margin = options.grid.margin || 0; plotOffset[a] = typeof margin == "number" ? margin : margin[a] || 0; } executeHooks(hooks.processOffset, [plotOffset]); // If the grid is visible, add its border width to the offset for (var a in plotOffset) { if (typeof options.grid.borderWidth == "object") { plotOffset[a] += showGrid ? options.grid.borderWidth[a] : 0; } else { plotOffset[a] += showGrid ? options.grid.borderWidth : 0; } } // init axes $.each(axes, function (_, axis) { axis.show = axis.options.show; if (axis.show == null) axis.show = axis.used; // by default an axis is visible if it's got data axis.reserveSpace = axis.show || axis.options.reserveSpace; setRange(axis); }); if (showGrid) { // determine from the placeholder the font size ~ height of font ~ 1 em var fontDefaults = { style: placeholder.css("font-style"), size: Math.round( 0.8 * (+placeholder.css("font-size").replace("px", "") || 13) ), variant: placeholder.css("font-variant"), weight: placeholder.css("font-weight"), family: placeholder.css("font-family"), }; var allocatedAxes = $.grep(axes, function (axis) { return axis.reserveSpace; }); $.each(allocatedAxes, function (_, axis) { // make the ticks setupTickGeneration(axis); setTicks(axis); snapRangeToTicks(axis, axis.ticks); // find labelWidth/Height for axis axis.font = $.extend({}, fontDefaults, axis.options.font); measureTickLabels(axis); }); // with all dimensions calculated, we can compute the // axis bounding boxes, start from the outside // (reverse order) for (i = allocatedAxes.length - 1; i >= 0; --i) allocateAxisBoxFirstPhase(allocatedAxes[i]); // make sure we've got enough space for things that // might stick out adjustLayoutForThingsStickingOut(); $.each(allocatedAxes, function (_, axis) { allocateAxisBoxSecondPhase(axis); }); } plotWidth = canvasWidth - plotOffset.left - plotOffset.right; plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top; // now we got the proper plot dimensions, we can compute the scaling $.each(axes, function (_, axis) { setTransformationHelpers(axis); }); insertLegend(); } function setRange(axis) { var opts = axis.options, min = +(opts.min != null ? opts.min : axis.datamin), max = +(opts.max != null ? opts.max : axis.datamax), delta = max - min; if (delta == 0.0) { // degenerate case var widen = max == 0 ? 1 : 0.01; if (opts.min == null) min -= widen; // always widen max if we couldn't widen min to ensure we // don't fall into min == max which doesn't work if (opts.max == null || opts.min != null) max += widen; } else { // consider autoscaling var margin = opts.autoscaleMargin; if (margin != null) { if (opts.min == null) { min -= delta * margin; // make sure we don't go below zero if all values // are positive if (min < 0 && axis.datamin != null && axis.datamin >= 0) min = 0; } if (opts.max == null) { max += delta * margin; if (max > 0 && axis.datamax != null && axis.datamax <= 0) max = 0; } } } axis.min = min; axis.max = max; } function setupTickGeneration(axis) { var opts = axis.options; // estimate number of ticks var noTicks; if (typeof opts.ticks == "number" && opts.ticks > 0) noTicks = opts.ticks; // heuristic based on the model a*sqrt(x) fitted to // some data points that seemed reasonable else noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? canvasWidth : canvasHeight); axis.delta = (axis.max - axis.min) / noTicks; // Time mode was moved to a plug-in in 0.8, but since so many people use this // we'll add an especially friendly make sure they remembered to include it. if (opts.mode == "time" && !axis.tickGenerator) { throw new Error("Time mode requires the flot.time plugin."); } // Flot supports base-10 axes; any other mode else is handled by a plug-in, // like flot.time.js. if (!axis.tickGenerator) { axis.tickGenerator = function (axis) { var maxDec = opts.tickDecimals, dec = -Math.floor(Math.log(axis.delta) / Math.LN10); if (maxDec != null && dec > maxDec) dec = maxDec; var magn = Math.pow(10, -dec), norm = axis.delta / magn, // norm is between 1.0 and 10.0 size, ticks = [], start, i = 0, v = Number.NaN, prev; if (norm < 1.5) size = 1; else if (norm < 3) { size = 2; // special case for 2.5, requires an extra decimal if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) { size = 2.5; ++dec; } } else if (norm < 7.5) size = 5; else size = 10; size *= magn; if (opts.minTickSize != null && size < opts.minTickSize) size = opts.minTickSize; axis.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec); axis.tickSize = opts.tickSize || size; start = floorInBase(axis.min, axis.tickSize); do { prev = v; v = start + i * axis.tickSize; ticks.push(v); ++i; } while (v < axis.max && v != prev); return ticks; }; axis.tickFormatter = function (value, axis) { var factor = axis.tickDecimals ? Math.pow(10, axis.tickDecimals) : 1; var formatted = "" + Math.round(value * factor) / factor; // If tickDecimals was specified, ensure that we have exactly that // much precision; otherwise default to the value's own precision. if (axis.tickDecimals != null) { var decimal = formatted.indexOf("."); var precision = decimal == -1 ? 0 : formatted.length - decimal - 1; if (precision < axis.tickDecimals) { return ( (precision ? formatted : formatted + ".") + ("" + factor).substr(1, axis.tickDecimals - precision) ); } } return formatted; }; } if ($.isFunction(opts.tickFormatter)) axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); }; if (opts.alignTicksWithAxis != null) { var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[ opts.alignTicksWithAxis - 1 ]; if (otherAxis && otherAxis.used && otherAxis != axis) { // consider snapping min/max to outermost nice ticks var niceTicks = axis.tickGenerator(axis); if (niceTicks.length > 0) { if (opts.min == null) axis.min = Math.min(axis.min, niceTicks[0]); if (opts.max == null && niceTicks.length > 1) axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]); } axis.tickGenerator = function (axis) { // copy ticks, scaled to this axis var ticks = [], v, i; for (i = 0; i < otherAxis.ticks.length; ++i) { v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min); v = axis.min + v * (axis.max - axis.min); ticks.push(v); } return ticks; }; // we might need an extra decimal since forced // ticks don't necessarily fit naturally if (!axis.mode && opts.tickDecimals == null) { var extraDec = Math.max( 0, -Math.floor(Math.log(axis.delta) / Math.LN10) + 1 ), ts = axis.tickGenerator(axis); // only proceed if the tick interval rounded // with an extra decimal doesn't give us a // zero at end if ( !( ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec)) ) ) axis.tickDecimals = extraDec; } } } } function setTicks(axis) { var oticks = axis.options.ticks, ticks = []; if (oticks == null || (typeof oticks == "number" && oticks > 0)) ticks = axis.tickGenerator(axis); else if (oticks) { if ($.isFunction(oticks)) // generate the ticks ticks = oticks(axis); else ticks = oticks; } // clean up/labelify the supplied ticks, copy them over var i, v; axis.ticks = []; for (i = 0; i < ticks.length; ++i) { var label = null; var t = ticks[i]; if (typeof t == "object") { v = +t[0]; if (t.length > 1) label = t[1]; } else v = +t; if (label == null) label = axis.tickFormatter(v, axis); if (!isNaN(v)) axis.ticks.push({ v: v, label: label }); } } function snapRangeToTicks(axis, ticks) { if (axis.options.autoscaleMargin && ticks.length > 0) { // snap to ticks if (axis.options.min == null) axis.min = Math.min(axis.min, ticks[0].v); if (axis.options.max == null && ticks.length > 1) axis.max = Math.max(axis.max, ticks[ticks.length - 1].v); } } function draw() { ctx.clearRect(0, 0, canvasWidth, canvasHeight); executeHooks(hooks.drawBackground, [ctx]); var grid = options.grid; // draw background, if any if (grid.show && grid.backgroundColor) drawBackground(); if (grid.show && !grid.aboveData) { drawGrid(); drawAxisLabels(); } for (var i = 0; i < series.length; ++i) { executeHooks(hooks.drawSeries, [ctx, series[i]]); drawSeries(series[i]); } executeHooks(hooks.draw, [ctx]); if (grid.show && grid.aboveData) { drawGrid(); drawAxisLabels(); } } function extractRange(ranges, coord) { var axis, from, to, key, axes = allAxes(); for (var i = 0; i < axes.length; ++i) { axis = axes[i]; if (axis.direction == coord) { key = coord + axis.n + "axis"; if (!ranges[key] && axis.n == 1) key = coord + "axis"; // support x1axis as xaxis if (ranges[key]) { from = ranges[key].from; to = ranges[key].to; break; } } } // backwards-compat stuff - to be removed in future if (!ranges[key]) { axis = coord == "x" ? xaxes[0] : yaxes[0]; from = ranges[coord + "1"]; to = ranges[coord + "2"]; } // auto-reverse as an added bonus if (from != null && to != null && from > to) { var tmp = from; from = to; to = tmp; } return { from: from, to: to, axis: axis }; } function drawBackground() { ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); ctx.fillStyle = getColorOrGradient( options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)" ); ctx.fillRect(0, 0, plotWidth, plotHeight); ctx.restore(); } function drawGrid() { var i, axes, bw, bc; ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); // draw markings var markings = options.grid.markings; if (markings) { if ($.isFunction(markings)) { axes = plot.getAxes(); // xmin etc. is backwards compatibility, to be // removed in the future axes.xmin = axes.xaxis.min; axes.xmax = axes.xaxis.max; axes.ymin = axes.yaxis.min; axes.ymax = axes.yaxis.max; markings = markings(axes); } for (i = 0; i < markings.length; ++i) { var m = markings[i], xrange = extractRange(m, "x"), yrange = extractRange(m, "y"); // fill in missing if (xrange.from == null) xrange.from = xrange.axis.min; if (xrange.to == null) xrange.to = xrange.axis.max; if (yrange.from == null) yrange.from = yrange.axis.min; if (yrange.to == null) yrange.to = yrange.axis.max; // clip if ( xrange.to < xrange.axis.min || xrange.from > xrange.axis.max || yrange.to < yrange.axis.min || yrange.from > yrange.axis.max ) continue; xrange.from = Math.max(xrange.from, xrange.axis.min); xrange.to = Math.min(xrange.to, xrange.axis.max); yrange.from = Math.max(yrange.from, yrange.axis.min); yrange.to = Math.min(yrange.to, yrange.axis.max); if (xrange.from == xrange.to && yrange.from == yrange.to) continue; // then draw xrange.from = xrange.axis.p2c(xrange.from); xrange.to = xrange.axis.p2c(xrange.to); yrange.from = yrange.axis.p2c(yrange.from); yrange.to = yrange.axis.p2c(yrange.to); if (xrange.from == xrange.to || yrange.from == yrange.to) { // draw line ctx.beginPath(); ctx.strokeStyle = m.color || options.grid.markingsColor; ctx.lineWidth = m.lineWidth || options.grid.markingsLineWidth; ctx.moveTo(xrange.from, yrange.from); ctx.lineTo(xrange.to, yrange.to); ctx.stroke(); } else { // fill area ctx.fillStyle = m.color || options.grid.markingsColor; ctx.fillRect( xrange.from, yrange.to, xrange.to - xrange.from, yrange.from - yrange.to ); } } } // draw the ticks axes = allAxes(); bw = options.grid.borderWidth; for (var j = 0; j < axes.length; ++j) { var axis = axes[j], box = axis.box, t = axis.tickLength, x, y, xoff, yoff; if (!axis.show || axis.ticks.length == 0) continue; ctx.strokeStyle = axis.options.tickColor || $.color.parse(axis.options.color).scale("a", 0.22).toString(); ctx.lineWidth = 1; // find the edges if (axis.direction == "x") { x = 0; if (t == "full") y = axis.position == "top" ? 0 : plotHeight; else y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0); } else { y = 0; if (t == "full") x = axis.position == "left" ? 0 : plotWidth; else x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0); } // draw tick bar if (!axis.innermost) { ctx.beginPath(); xoff = yoff = 0; if (axis.direction == "x") xoff = plotWidth; else yoff = plotHeight; if (ctx.lineWidth == 1) { x = Math.floor(x) + 0.5; y = Math.floor(y) + 0.5; } ctx.moveTo(x, y); ctx.lineTo(x + xoff, y + yoff); ctx.stroke(); } // draw ticks ctx.beginPath(); for (i = 0; i < axis.ticks.length; ++i) { var v = axis.ticks[i].v; xoff = yoff = 0; if ( isNaN(v) || v < axis.min || v > axis.max || // skip those lying on the axes if we got a border (t == "full" && ((typeof bw == "object" && bw[axis.position] > 0) || bw > 0) && (v == axis.min || v == axis.max)) ) continue; if (axis.direction == "x") { x = axis.p2c(v); yoff = t == "full" ? -plotHeight : t; if (axis.position == "top") yoff = -yoff; } else { y = axis.p2c(v); xoff = t == "full" ? -plotWidth : t; if (axis.position == "left") xoff = -xoff; } if (ctx.lineWidth == 1) { if (axis.direction == "x") x = Math.floor(x) + 0.5; else y = Math.floor(y) + 0.5; } ctx.moveTo(x, y); ctx.lineTo(x + xoff, y + yoff); } ctx.stroke(); } // draw border if (bw) { // If either borderWidth or borderColor is an object, then draw the border // line by line instead of as one rectangle bc = options.grid.borderColor; if (typeof bw == "object" || typeof bc == "object") { if (typeof bw !== "object") { bw = { top: bw, right: bw, bottom: bw, left: bw }; } if (typeof bc !== "object") { bc = { top: bc, right: bc, bottom: bc, left: bc }; } if (bw.top > 0) { ctx.strokeStyle = bc.top; ctx.lineWidth = bw.top; ctx.beginPath(); ctx.moveTo(0 - bw.left, 0 - bw.top / 2); ctx.lineTo(plotWidth, 0 - bw.top / 2); ctx.stroke(); } if (bw.right > 0) { ctx.strokeStyle = bc.right; ctx.lineWidth = bw.right; ctx.beginPath(); ctx.moveTo(plotWidth + bw.right / 2, 0 - bw.top); ctx.lineTo(plotWidth + bw.right / 2, plotHeight); ctx.stroke(); } if (bw.bottom > 0) { ctx.strokeStyle = bc.bottom; ctx.lineWidth = bw.bottom; ctx.beginPath(); ctx.moveTo(plotWidth + bw.right, plotHeight + bw.bottom / 2); ctx.lineTo(0, plotHeight + bw.bottom / 2); ctx.stroke(); } if (bw.left > 0) { ctx.strokeStyle = bc.left; ctx.lineWidth = bw.left; ctx.beginPath(); ctx.moveTo(0 - bw.left / 2, plotHeight + bw.bottom); ctx.lineTo(0 - bw.left / 2, 0); ctx.stroke(); } } else { ctx.lineWidth = bw; ctx.strokeStyle = options.grid.borderColor; ctx.strokeRect(-bw / 2, -bw / 2, plotWidth + bw, plotHeight + bw); } } ctx.restore(); } function drawAxisLabels() { ctx.save(); $.each(allAxes(), function (_, axis) { if (!axis.show || axis.ticks.length == 0) return; var box = axis.box, f = axis.font; // placeholder.append('
') // debug ctx.fillStyle = axis.options.color; // Important: Don't use quotes around axis.font.family! Just around single // font names like 'Times New Roman' that have a space or special character in it. ctx.font = f.style + " " + f.variant + " " + f.weight + " " + f.size + "px " + f.family; ctx.textAlign = "start"; // middle align the labels - top would be more // natural, but browsers can differ a pixel or two in // where they consider the top to be, so instead we // middle align to minimize variation between browsers // and compensate when calculating the coordinates ctx.textBaseline = "middle"; for (var i = 0; i < axis.ticks.length; ++i) { var tick = axis.ticks[i]; if (!tick.label || tick.v < axis.min || tick.v > axis.max) continue; var x, y, offset = 0, line; for (var k = 0; k < tick.lines.length; ++k) { line = tick.lines[k]; if (axis.direction == "x") { x = plotOffset.left + axis.p2c(tick.v) - line.width / 2; if (axis.position == "bottom") y = box.top + box.padding; else y = box.top + box.height - box.padding - tick.height; } else { y = plotOffset.top + axis.p2c(tick.v) - tick.height / 2; if (axis.position == "left") x = box.left + box.width - box.padding - line.width; else x = box.left + box.padding; } // account for middle aligning and line number y += line.height / 2 + offset; offset += line.height; if (!!(window.opera && window.opera.version().split(".")[0] < 12)) { // FIXME: LEGACY BROWSER FIX // AFFECTS: Opera < 12.00 // round the coordinates since Opera // otherwise switches to more ugly // rendering (probably non-hinted) and // offset the y coordinates since it seems // to be off pretty consistently compared // to the other browsers x = Math.floor(x); y = Math.ceil(y - 2); } ctx.fillText(line.text, x, y); } } }); ctx.restore(); } function drawSeries(series) { if (series.lines.show) drawSeriesLines(series); if (series.bars.show) drawSeriesBars(series); if (series.points.show) drawSeriesPoints(series); } function drawSeriesLines(series) { function plotLine(datapoints, xoffset, yoffset, axisx, axisy) { var points = datapoints.points, ps = datapoints.pointsize, prevx = null, prevy = null; ctx.beginPath(); for (var i = ps; i < points.length; i += ps) { var x1 = points[i - ps], y1 = points[i - ps + 1], x2 = points[i], y2 = points[i + 1]; if (x1 == null || x2 == null) continue; // clip with ymin if (y1 <= y2 && y1 < axisy.min) { if (y2 < axisy.min) continue; // line segment is outside // compute new intersection point x1 = ((axisy.min - y1) / (y2 - y1)) * (x2 - x1) + x1; y1 = axisy.min; } else if (y2 <= y1 && y2 < axisy.min) { if (y1 < axisy.min) continue; x2 = ((axisy.min - y1) / (y2 - y1)) * (x2 - x1) + x1; y2 = axisy.min; } // clip with ymax if (y1 >= y2 && y1 > axisy.max) { if (y2 > axisy.max) continue; x1 = ((axisy.max - y1) / (y2 - y1)) * (x2 - x1) + x1; y1 = axisy.max; } else if (y2 >= y1 && y2 > axisy.max) { if (y1 > axisy.max) continue; x2 = ((axisy.max - y1) / (y2 - y1)) * (x2 - x1) + x1; y2 = axisy.max; } // clip with xmin if (x1 <= x2 && x1 < axisx.min) { if (x2 < axisx.min) continue; y1 = ((axisx.min - x1) / (x2 - x1)) * (y2 - y1) + y1; x1 = axisx.min; } else if (x2 <= x1 && x2 < axisx.min) { if (x1 < axisx.min) continue; y2 = ((axisx.min - x1) / (x2 - x1)) * (y2 - y1) + y1; x2 = axisx.min; } // clip with xmax if (x1 >= x2 && x1 > axisx.max) { if (x2 > axisx.max) continue; y1 = ((axisx.max - x1) / (x2 - x1)) * (y2 - y1) + y1; x1 = axisx.max; } else if (x2 >= x1 && x2 > axisx.max) { if (x1 > axisx.max) continue; y2 = ((axisx.max - x1) / (x2 - x1)) * (y2 - y1) + y1; x2 = axisx.max; } if (x1 != prevx || y1 != prevy) ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset); prevx = x2; prevy = y2; ctx.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2) + yoffset); } ctx.stroke(); } function plotLineArea(datapoints, axisx, axisy) { var points = datapoints.points, ps = datapoints.pointsize, bottom = Math.min(Math.max(0, axisy.min), axisy.max), i = 0, top, areaOpen = false, ypos = 1, segmentStart = 0, segmentEnd = 0; // we process each segment in two turns, first forward // direction to sketch out top, then once we hit the // end we go backwards to sketch the bottom while (true) { if (ps > 0 && i > points.length + ps) break; i += ps; // ps is negative if going backwards var x1 = points[i - ps], y1 = points[i - ps + ypos], x2 = points[i], y2 = points[i + ypos]; if (areaOpen) { if (ps > 0 && x1 != null && x2 == null) { // at turning point segmentEnd = i; ps = -ps; ypos = 2; continue; } if (ps < 0 && i == segmentStart + ps) { // done with the reverse sweep ctx.fill(); areaOpen = false; ps = -ps; ypos = 1; i = segmentStart = segmentEnd + ps; continue; } } if (x1 == null || x2 == null) continue; // clip x values // clip with xmin if (x1 <= x2 && x1 < axisx.min) { if (x2 < axisx.min) continue; y1 = ((axisx.min - x1) / (x2 - x1)) * (y2 - y1) + y1; x1 = axisx.min; } else if (x2 <= x1 && x2 < axisx.min) { if (x1 < axisx.min) continue; y2 = ((axisx.min - x1) / (x2 - x1)) * (y2 - y1) + y1; x2 = axisx.min; } // clip with xmax if (x1 >= x2 && x1 > axisx.max) { if (x2 > axisx.max) continue; y1 = ((axisx.max - x1) / (x2 - x1)) * (y2 - y1) + y1; x1 = axisx.max; } else if (x2 >= x1 && x2 > axisx.max) { if (x1 > axisx.max) continue; y2 = ((axisx.max - x1) / (x2 - x1)) * (y2 - y1) + y1; x2 = axisx.max; } if (!areaOpen) { // open area ctx.beginPath(); ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom)); areaOpen = true; } // now first check the case where both is outside if (y1 >= axisy.max && y2 >= axisy.max) { ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max)); ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max)); continue; } else if (y1 <= axisy.min && y2 <= axisy.min) { ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min)); ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min)); continue; } // else it's a bit more complicated, there might // be a flat maxed out rectangle first, then a // triangular cutout or reverse; to find these // keep track of the current x values var x1old = x1, x2old = x2; // clip the y values, without shortcutting, we // go through all cases in turn // clip with ymin if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) { x1 = ((axisy.min - y1) / (y2 - y1)) * (x2 - x1) + x1; y1 = axisy.min; } else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) { x2 = ((axisy.min - y1) / (y2 - y1)) * (x2 - x1) + x1; y2 = axisy.min; } // clip with ymax if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) { x1 = ((axisy.max - y1) / (y2 - y1)) * (x2 - x1) + x1; y1 = axisy.max; } else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) { x2 = ((axisy.max - y1) / (y2 - y1)) * (x2 - x1) + x1; y2 = axisy.max; } // if the x value was changed we got a rectangle // to fill if (x1 != x1old) { ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1)); // it goes to (x1, y1), but we fill that below } // fill triangular section, this sometimes result // in redundant points if (x1, y1) hasn't changed // from previous line to, but we just ignore that ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1)); ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2)); // fill the other rectangle if it's there if (x2 != x2old) { ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2)); ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2)); } } } ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); ctx.lineJoin = "round"; var lw = series.lines.lineWidth, sw = series.shadowSize; // FIXME: consider another form of shadow when filling is turned on if (lw > 0 && sw > 0) { // draw shadow as a thick and thin line with transparency ctx.lineWidth = sw; ctx.strokeStyle = "rgba(0,0,0,0.1)"; // position shadow at angle from the mid of line var angle = Math.PI / 18; plotLine( series.datapoints, Math.sin(angle) * (lw / 2 + sw / 2), Math.cos(angle) * (lw / 2 + sw / 2), series.xaxis, series.yaxis ); ctx.lineWidth = sw / 2; plotLine( series.datapoints, Math.sin(angle) * (lw / 2 + sw / 4), Math.cos(angle) * (lw / 2 + sw / 4), series.xaxis, series.yaxis ); } ctx.lineWidth = lw; ctx.strokeStyle = series.color; var fillStyle = getFillStyle(series.lines, series.color, 0, plotHeight); if (fillStyle) { ctx.fillStyle = fillStyle; plotLineArea(series.datapoints, series.xaxis, series.yaxis); } if (lw > 0) plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis); ctx.restore(); } function drawSeriesPoints(series) { function plotPoints( datapoints, radius, fillStyle, offset, shadow, axisx, axisy, symbol ) { var points = datapoints.points, ps = datapoints.pointsize; for (var i = 0; i < points.length; i += ps) { var x = points[i], y = points[i + 1]; if ( x == null || x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max ) continue; ctx.beginPath(); x = axisx.p2c(x); y = axisy.p2c(y) + offset; if (symbol == "circle") ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false); else symbol(ctx, x, y, radius, shadow); ctx.closePath(); if (fillStyle) { ctx.fillStyle = fillStyle; ctx.fill(); } ctx.stroke(); } } ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); var lw = series.points.lineWidth, sw = series.shadowSize, radius = series.points.radius, symbol = series.points.symbol; // If the user sets the line width to 0, we change it to a very // small value. A line width of 0 seems to force the default of 1. // Doing the conditional here allows the shadow setting to still be // optional even with a lineWidth of 0. if (lw == 0) lw = 0.0001; if (lw > 0 && sw > 0) { // draw shadow in two steps var w = sw / 2; ctx.lineWidth = w; ctx.strokeStyle = "rgba(0,0,0,0.1)"; plotPoints( series.datapoints, radius, null, w + w / 2, true, series.xaxis, series.yaxis, symbol ); ctx.strokeStyle = "rgba(0,0,0,0.2)"; plotPoints( series.datapoints, radius, null, w / 2, true, series.xaxis, series.yaxis, symbol ); } ctx.lineWidth = lw; ctx.strokeStyle = series.color; plotPoints( series.datapoints, radius, getFillStyle(series.points, series.color), 0, false, series.xaxis, series.yaxis, symbol ); ctx.restore(); } function drawBar( x, y, b, barLeft, barRight, offset, fillStyleCallback, axisx, axisy, c, horizontal, lineWidth ) { var left, right, bottom, top, drawLeft, drawRight, drawTop, drawBottom, tmp; // in horizontal mode, we start the bar from the left // instead of from the bottom so it appears to be // horizontal rather than vertical if (horizontal) { drawBottom = drawRight = drawTop = true; drawLeft = false; left = b; right = x; top = y + barLeft; bottom = y + barRight; // account for negative bars if (right < left) { tmp = right; right = left; left = tmp; drawLeft = true; drawRight = false; } } else { drawLeft = drawRight = drawTop = true; drawBottom = false; left = x + barLeft; right = x + barRight; bottom = b; top = y; // account for negative bars if (top < bottom) { tmp = top; top = bottom; bottom = tmp; drawBottom = true; drawTop = false; } } // clip if ( right < axisx.min || left > axisx.max || top < axisy.min || bottom > axisy.max ) return; if (left < axisx.min) { left = axisx.min; drawLeft = false; } if (right > axisx.max) { right = axisx.max; drawRight = false; } if (bottom < axisy.min) { bottom = axisy.min; drawBottom = false; } if (top > axisy.max) { top = axisy.max; drawTop = false; } left = axisx.p2c(left); bottom = axisy.p2c(bottom); right = axisx.p2c(right); top = axisy.p2c(top); // fill the bar if (fillStyleCallback) { c.beginPath(); c.moveTo(left, bottom); c.lineTo(left, top); c.lineTo(right, top); c.lineTo(right, bottom); c.fillStyle = fillStyleCallback(bottom, top); c.fill(); } // draw outline if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) { c.beginPath(); // FIXME: inline moveTo is buggy with excanvas c.moveTo(left, bottom + offset); if (drawLeft) c.lineTo(left, top + offset); else c.moveTo(left, top + offset); if (drawTop) c.lineTo(right, top + offset); else c.moveTo(right, top + offset); if (drawRight) c.lineTo(right, bottom + offset); else c.moveTo(right, bottom + offset); if (drawBottom) c.lineTo(left, bottom + offset); else c.moveTo(left, bottom + offset); c.stroke(); } } function drawSeriesBars(series) { function plotBars( datapoints, barLeft, barRight, offset, fillStyleCallback, axisx, axisy ) { var points = datapoints.points, ps = datapoints.pointsize; for (var i = 0; i < points.length; i += ps) { if (points[i] == null) continue; drawBar( points[i], points[i + 1], points[i + 2], barLeft, barRight, offset, fillStyleCallback, axisx, axisy, ctx, series.bars.horizontal, series.bars.lineWidth ); } } ctx.save(); ctx.translate(plotOffset.left, plotOffset.top); // FIXME: figure out a way to add shadows (for instance along the right edge) ctx.lineWidth = series.bars.lineWidth; ctx.strokeStyle = series.color; var barLeft; switch (series.bars.align) { case "left": barLeft = 0; break; case "right": barLeft = -series.bars.barWidth; break; case "center": barLeft = -series.bars.barWidth / 2; break; default: throw new Error("Invalid bar alignment: " + series.bars.align); } var fillStyleCallback = series.bars.fill ? function (bottom, top) { return getFillStyle(series.bars, series.color, bottom, top); } : null; plotBars( series.datapoints, barLeft, barLeft + series.bars.barWidth, 0, fillStyleCallback, series.xaxis, series.yaxis ); ctx.restore(); } function getFillStyle(filloptions, seriesColor, bottom, top) { var fill = filloptions.fill; if (!fill) return null; if (filloptions.fillColor) return getColorOrGradient( filloptions.fillColor, bottom, top, seriesColor ); var c = $.color.parse(seriesColor); c.a = typeof fill == "number" ? fill : 0.4; c.normalize(); return c.toString(); } function insertLegend() { placeholder.find(".legend").remove(); if (!options.legend.show) return; var fragments = [], entries = [], rowStarted = false, lf = options.legend.labelFormatter, s, label; // Build a list of legend entries, with each having a label and a color for (var i = 0; i < series.length; ++i) { s = series[i]; if (s.label) { label = lf ? lf(s.label, s) : s.label; if (label) { entries.push({ label: label, color: s.color, }); } } } // Sort the legend using either the default or a custom comparator if (options.legend.sorted) { if ($.isFunction(options.legend.sorted)) { entries.sort(options.legend.sorted); } else if (options.legend.sorted == "reverse") { entries.reverse(); } else { var ascending = options.legend.sorted != "descending"; entries.sort(function (a, b) { return a.label == b.label ? 0 : a.label < b.label != ascending ? 1 : -1; // Logical XOR }); } } // Generate markup for the list of entries, in their final order for (var i = 0; i < entries.length; ++i) { var entry = entries[i]; if (i % options.legend.noColumns == 0) { if (rowStarted) fragments.push(""); fragments.push(""); rowStarted = true; } fragments.push( '
' + '' + entry.label + "" ); } if (rowStarted) fragments.push(""); if (fragments.length == 0) return; var table = '' + fragments.join("") + "
"; if (options.legend.container != null) $(options.legend.container).html(table); else { var pos = "", p = options.legend.position, m = options.legend.margin; if (m[0] == null) m = [m, m]; if (p.charAt(0) == "n") pos += "top:" + (m[1] + plotOffset.top) + "px;"; else if (p.charAt(0) == "s") pos += "bottom:" + (m[1] + plotOffset.bottom) + "px;"; if (p.charAt(1) == "e") pos += "right:" + (m[0] + plotOffset.right) + "px;"; else if (p.charAt(1) == "w") pos += "left:" + (m[0] + plotOffset.left) + "px;"; var legend = $( '
' + table.replace('style="', 'style="position:absolute;' + pos + ";") + "
" ).appendTo(placeholder); if (options.legend.backgroundOpacity != 0.0) { // put in the transparent background // separately to avoid blended labels and // label boxes var c = options.legend.backgroundColor; if (c == null) { c = options.grid.backgroundColor; if (c && typeof c == "string") c = $.color.parse(c); else c = $.color.extract(legend, "background-color"); c.a = 1; c = c.toString(); } var div = legend.children(); $( '
' ) .prependTo(legend) .css("opacity", options.legend.backgroundOpacity); } } } // interactive features var highlights = [], redrawTimeout = null; // returns the data item the mouse is over, or null if none is found function findNearbyItem(mouseX, mouseY, seriesFilter) { var maxDistance = options.grid.mouseActiveRadius, smallestDistance = maxDistance * maxDistance + 1, item = null, foundPoint = false, i, j, ps; for (i = series.length - 1; i >= 0; --i) { if (!seriesFilter(series[i])) continue; var s = series[i], axisx = s.xaxis, axisy = s.yaxis, points = s.datapoints.points, mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster my = axisy.c2p(mouseY), maxx = maxDistance / axisx.scale, maxy = maxDistance / axisy.scale; ps = s.datapoints.pointsize; // with inverse transforms, we can't use the maxx/maxy // optimization, sadly if (axisx.options.inverseTransform) maxx = Number.MAX_VALUE; if (axisy.options.inverseTransform) maxy = Number.MAX_VALUE; if (s.lines.show || s.points.show) { for (j = 0; j < points.length; j += ps) { var x = points[j], y = points[j + 1]; if (x == null) continue; // For points and lines, the cursor must be within a // certain distance to the data point if ( x - mx > maxx || x - mx < -maxx || y - my > maxy || y - my < -maxy ) continue; // We have to calculate distances in pixels, not in // data units, because the scales of the axes may be different var dx = Math.abs(axisx.p2c(x) - mouseX), dy = Math.abs(axisy.p2c(y) - mouseY), dist = dx * dx + dy * dy; // we save the sqrt // use <= to ensure last point takes precedence // (last generally means on top of) if (dist < smallestDistance) { smallestDistance = dist; item = [i, j / ps]; } } } if (s.bars.show && !item) { // no other point can be nearby var barLeft = s.bars.align == "left" ? 0 : -s.bars.barWidth / 2, barRight = barLeft + s.bars.barWidth; for (j = 0; j < points.length; j += ps) { var x = points[j], y = points[j + 1], b = points[j + 2]; if (x == null) continue; // for a bar graph, the cursor must be inside the bar if ( series[i].bars.horizontal ? mx <= Math.max(b, x) && mx >= Math.min(b, x) && my >= y + barLeft && my <= y + barRight : mx >= x + barLeft && mx <= x + barRight && my >= Math.min(b, y) && my <= Math.max(b, y) ) item = [i, j / ps]; } } } if (item) { i = item[0]; j = item[1]; ps = series[i].datapoints.pointsize; return { datapoint: series[i].datapoints.points.slice(j * ps, (j + 1) * ps), dataIndex: j, series: series[i], seriesIndex: i, }; } return null; } function onMouseMove(e) { if (options.grid.hoverable) triggerClickHoverEvent("plothover", e, function (s) { return s["hoverable"] != false; }); } function onMouseLeave(e) { if (options.grid.hoverable) triggerClickHoverEvent("plothover", e, function (s) { return false; }); } function onClick(e) { triggerClickHoverEvent("plotclick", e, function (s) { return s["clickable"] != false; }); } // trigger click or hover event (they send the same parameters // so we share their code) function triggerClickHoverEvent(eventname, event, seriesFilter) { var offset = eventHolder.offset(), canvasX = event.pageX - offset.left - plotOffset.left, canvasY = event.pageY - offset.top - plotOffset.top, pos = canvasToAxisCoords({ left: canvasX, top: canvasY }); pos.pageX = event.pageX; pos.pageY = event.pageY; var item = findNearbyItem(canvasX, canvasY, seriesFilter); if (item) { // fill in mouse pos for any listeners out there item.pageX = parseInt( item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left, 10 ); item.pageY = parseInt( item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top, 10 ); } if (options.grid.autoHighlight) { // clear auto-highlights for (var i = 0; i < highlights.length; ++i) { var h = highlights[i]; if ( h.auto == eventname && !( item && h.series == item.series && h.point[0] == item.datapoint[0] && h.point[1] == item.datapoint[1] ) ) unhighlight(h.series, h.point); } if (item) highlight(item.series, item.datapoint, eventname); } placeholder.trigger(eventname, [pos, item]); } function triggerRedrawOverlay() { var t = options.interaction.redrawOverlayInterval; if (t == -1) { // skip event queue drawOverlay(); return; } if (!redrawTimeout) redrawTimeout = setTimeout(drawOverlay, t); } function drawOverlay() { redrawTimeout = null; // draw highlights octx.save(); octx.clearRect(0, 0, canvasWidth, canvasHeight); octx.translate(plotOffset.left, plotOffset.top); var i, hi; for (i = 0; i < highlights.length; ++i) { hi = highlights[i]; if (hi.series.bars.show) drawBarHighlight(hi.series, hi.point); else drawPointHighlight(hi.series, hi.point); } octx.restore(); executeHooks(hooks.drawOverlay, [octx]); } function highlight(s, point, auto) { if (typeof s == "number") s = series[s]; if (typeof point == "number") { var ps = s.datapoints.pointsize; point = s.datapoints.points.slice(ps * point, ps * (point + 1)); } var i = indexOfHighlight(s, point); if (i == -1) { highlights.push({ series: s, point: point, auto: auto }); triggerRedrawOverlay(); } else if (!auto) highlights[i].auto = false; } function unhighlight(s, point) { if (s == null && point == null) { highlights = []; triggerRedrawOverlay(); } if (typeof s == "number") s = series[s]; if (typeof point == "number") point = s.data[point]; var i = indexOfHighlight(s, point); if (i != -1) { highlights.splice(i, 1); triggerRedrawOverlay(); } } function indexOfHighlight(s, p) { for (var i = 0; i < highlights.length; ++i) { var h = highlights[i]; if (h.series == s && h.point[0] == p[0] && h.point[1] == p[1]) return i; } return -1; } function drawPointHighlight(series, point) { var x = point[0], y = point[1], axisx = series.xaxis, axisy = series.yaxis, highlightColor = typeof series.highlightColor === "string" ? series.highlightColor : $.color.parse(series.color).scale("a", 0.5).toString(); if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max) return; var pointRadius = series.points.radius + series.points.lineWidth / 2; octx.lineWidth = pointRadius; octx.strokeStyle = highlightColor; var radius = 1.5 * pointRadius; x = axisx.p2c(x); y = axisy.p2c(y); octx.beginPath(); if (series.points.symbol == "circle") octx.arc(x, y, radius, 0, 2 * Math.PI, false); else series.points.symbol(octx, x, y, radius, false); octx.closePath(); octx.stroke(); } function drawBarHighlight(series, point) { var highlightColor = typeof series.highlightColor === "string" ? series.highlightColor : $.color.parse(series.color).scale("a", 0.5).toString(), fillStyle = highlightColor, barLeft = series.bars.align == "left" ? 0 : -series.bars.barWidth / 2; octx.lineWidth = series.bars.lineWidth; octx.strokeStyle = highlightColor; drawBar( point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth, 0, function () { return fillStyle; }, series.xaxis, series.yaxis, octx, series.bars.horizontal, series.bars.lineWidth ); } function getColorOrGradient(spec, bottom, top, defaultColor) { if (typeof spec == "string") return spec; else { // assume this is a gradient spec; IE currently only // supports a simple vertical gradient properly, so that's // what we support too var gradient = ctx.createLinearGradient(0, top, 0, bottom); for (var i = 0, l = spec.colors.length; i < l; ++i) { var c = spec.colors[i]; if (typeof c != "string") { var co = $.color.parse(defaultColor); if (c.brightness != null) co = co.scale("rgb", c.brightness); if (c.opacity != null) co.a *= c.opacity; c = co.toString(); } gradient.addColorStop(i / (l - 1), c); } return gradient; } } } // Add the plot function to the top level of the jQuery object $.plot = function (placeholder, data, options) { //var t0 = new Date(); var plot = new Plot($(placeholder), data, options, $.plot.plugins); //(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime())); return plot; }; $.plot.version = "0.8-alpha"; $.plot.plugins = []; // Also add the plot function as a chainable property $.fn.plot = function (data, options) { return this.each(function () { $.plot(this, data, options); }); }; // round to nearby lower multiple of base function floorInBase(n, base) { return base * Math.floor(n / base); } })(jQuery);